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On Fri, Jul 13, 2007 at 03:20:12PM +0200, Matus UHLAR - fantomas wrote:
> On 13.07.07 09:15, Matt Kettler wrote:
> > It should only match a missing header.

"missing header" doesn't mean "the header doesn't exist", btw. It's a subt=
difference, please see below.

> bug 5207 should be reopened then...


I'll try to keep it short, but here's what's going on:

A header is parsed as:

The header "exists:header_name" test really converts into:
header_data =3D~ /./

which requires that there be a character in the header_data.

MISSING_SUBJECT is the inverse of the "exists:Subject" rule, made using
a meta rule.

If the Subject header is actually missing, then there is no header_data, and
therefore the "/./" test fails.

If the Subject header exists, but has nothing but whitespace after the
colon ... there's no header_data, and therefore the "/./" test fails.

I'll put this in the bug for future reference.

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